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arXiv 0909.4250math.DSmath.CA
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子移位间因子映射的加权平衡态

Weighted equilibrium states for factor maps between subshifts

De-Jun Feng

摘要:

设$π:X\to Y$是因子映射,其中$(X,σ_X)$和$(Y,σ_Y)$是有限字母表上的子移位。假设$X$满足弱规范。设$\ba=(a_1,a_2)\in \R^2$与$a_1>0$和$a_2\geq 0$。令$f$是$X$上的连续函数,具有足够的正则性(例如Hölder连续性)。我们发现,有一个独特的移位不变的措施$μ$ $X$,最大化$μ(f)+a_1h_μ(σ_X)+ a_2h_{μ\circ π^{-1}}(σ_Y)$。特别地,采用$f\equiv 0$,我们看到在$X$上存在唯一不变测度$μ$,其使加权熵$a_1h_μ(σ_X)+ a_2h_{μ\circ π^{-1}}(σ_Y)$最大化。这回答了加佐拉和佩雷斯在《\cite{GaPe96}》中提出的一个悬而未决的问题。一个扩展也给高维情况。作为应用,我们证明了$k$ -环面上某些仿射不变集在对角自同态下具有满Hausdorff维数的不变测度的唯一性。

英文摘要:

Let $π:X\to Y$ be a factor map, where $(X,σ_X)$ and $(Y,σ_Y)$ are subshifts over finite alphabets. Assume that $X$ satisfies weak specification. Let $\ba=(a_1,a_2)\in \R^2$ with $a_1>0$ and $a_2\geq 0$. Let $f$ be a continuous function on $X$ with sufficient regularity (Hölder continuity, for instance). We show that there is a unique shift invariant measure $μ$ on $X$ that maximizes $μ(f)+a_1h_μ(σ_X)+ a_2h_{μ\circ π^{-1}}(σ_Y)$. In particular, taking $f\equiv 0$ we see that there is a unique invariant measure $μ$ on $X$ that maximizes the weighted entropy $a_1h_μ(σ_X)+ a_2h_{μ\circ π^{-1}}(σ_Y)$. This answers an open question raised by Gatzouras and Peres in \cite{GaPe96}. An extension is also given to high dimensional cases. As an application, we show the uniqueness of invariant measures with full Hausdorff dimension for certain affine invariant sets on the $k$-torus under a diagonal endomorphism.

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